UPDATE! Sidenote: For those of you who are not currently serving in a particular ministry yet, the principles written below are still applicable to you. This post is mainly about 'adding' more ministries into our lives, so a transition from none to one ministry is still an addition process, so it is still applicable for you! (thanks Nic ^^)
Luke 14:28 "For which of you, intending to build a tower, does not first sit down and estimate the cost, to see whether he has enough to complete it?" Here, Jesus didn't mention what the tower is for, or what is there to gain by completing the tower. He only talked about the costs, since it is a pre-requisite for anything to take place. Imagine going to a world-famous restaurant to eat at a 99% discount. The option to eat at merely 1% of the original price is an ludicrous bargain and surely everyone would want it. But can everyone afford it, if the original meal costs $10 million, and 1% of that is $100,000? Naturally no.
In Philippians 3:8, Paul also mentioned something about costs. "...I regard everything as loss because of the surpassing value of knowing Christ Jesus my Lord. For His sake I have suffered the loss of all things, and I regard them as rubbish, in order that I may gain Christ." He calls these costs 'rubbish', worthless, NOT nothing. As compared to the blessings, costs can be extremely insignificant, but failing to recognize them is often what will lead us to burn outs.
What season are you at currently? What does God want of you out of this particular season? This is a very important question to ask before deciding to embark on a new ministry. Is it a season of resting, of serving, of growth, or of what? I would highly recommend you to consider joining a particular ministry or not after answering these questions sincerely. If you earnestly cannot figure it out through prayers and reflection, ask your leaders or your trusted spiritual buddies. Do not rush into joining anything, though you're definitely free to explore and try out. This is because different ministries would require differing amount of giving and would also result in differing amounts of receiving. Initially, when I first came to university, I was in a season of recovery from past hurts and finding my footing in school. I had very little to give and needed to receive a lot in many aspects. So my initial thought was to reject joining any new ministry, as I was barely managing to hang on to my current one. But God in His wisdom told me to join VCF in school, because He knew that I would receive a lot through it, and can simply give as much as I am willing and able to at the moment. However, I knew that apart from VCF it would be quite unwise to join any other CCA (like Dance or any sports-related club) and pursue any other interest, which would require me to give a lot, be it time, physical and emotional energy, which I lack.
Psalm 139: 23-24 "Search me, God and know my heart; test me and know my anxious thoughts. See if there is any offensive way in me, and lead me in the way everlasting."